Online PHP editor | output for jo1IG

@ 2013-01-11T14:25:36Z

<?php

function decorate(callable $fn, callable $decorator)
{
	$wrapper = $decorator();

    return function() use ($fn, $wrapper) {
        $gen = $wrapper();

        // Only call the wrapped function if the decorator made "yield"
        if (!$gen instanceof \Generator) {
            return $gen;
        }

        // Use the yielded arguments, forward all if none given.
        if (is_array($gen->current())) {
            $arguments = $gen->current();
        } else {
            $arguments = func_get_args();
        }

        // Forward all throwed Exceptions
        try {
            // Send the decorated function's return value into the
            // decorator as return value of "yield"
        	$gen->send(call_user_func_array($fn, $arguments));
        } catch (\Exception $e) {
            $gen->throw($e);
        }
    };
}

function foo($bar)
{
    throw new Exception("Error $bar!");
}

function catch_all_exceptions()
{
    return function() {
        try {
            (yield);
        } catch (\Exception $e) {
            echo "catch_all_exceptions: Caught Exception: $e\n";
        }
    };
}

function once() {
    return function() {
        static $return;
        static $called = false;

        if ($called) {
            return $return;
        } else {
            $return = (yield);
            $called = true;
        }
    };
}

function do_something_before()
{
    return function() {
        echo "Before!\n";
        yield;
    };
}

$bar = decorate(function() { echo "Hello\n"; }, "once");
$bar();
$bar();

$foo = decorate(decorate("foo", "catch_all_exceptions"), "do_something_before");
var_dump($foo("bar"));

Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: Hello Hello Before! catch_all_exceptions: Caught Exception: Exception: Error bar! in /in/jo1IG:35 Stack trace: #0 /in/jo1IG(26): foo('bar') #1 /in/jo1IG(26): {closure}('bar') #2 /in/jo1IG(76): {closure}('bar') #3 {main} NULL
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.28: Fatal error: Generators cannot return values using "return" in /in/jo1IG on line 55
Process exited with code 255.
Output for 5.4.0 - 5.4.45: Notice: Use of undefined constant yield - assumed 'yield' in /in/jo1IG on line 57 Before! Notice: Use of undefined constant yield - assumed 'yield' in /in/jo1IG on line 67 NULL
Output for 5.3.0 - 5.3.29: Catchable fatal error: Argument 1 passed to decorate() must be an instance of callable, instance of Closure given, called in /in/jo1IG on line 71 and defined in /in/jo1IG on line 3
Process exited with code 255.
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17: Parse error: syntax error, unexpected T_FUNCTION in /in/jo1IG on line 7
Process exited with code 255.
Output for 5.0.0 - 5.0.5: Parse error: parse error, unexpected T_FUNCTION in /in/jo1IG on line 7
Process exited with code 255.
Output for 4.4.2 - 4.4.9: Parse error: syntax error, unexpected T_STRING, expecting ')' in /in/jo1IG on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1: Parse error: parse error, unexpected T_STRING, expecting ')' in /in/jo1IG on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error, expecting `')'' in /in/jo1IG on line 3
Process exited with code 255.

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